As concerns Greek alchemy, I shall content myself with a passage from a work _On the Sacred Art_, attributed to OLYMPIODORUS (sixth century A.D.), followed by some quotations from and references to the _Turba_. In the former work it is stated on the authority of HORUS that "The proper end of the whole art is to obtain the semen of the male secretly, seeing that all things are male and female. Hence (we read further) Horus says in a certain place: Join the male and the female, and you will find that which is sought; as a fact, without this process of re-union, nothing can succeed, for Nature charms Nature," _etc_. The _Turba_ insistently commands those who would succeed in the Art, to conjoin the male with the female,(1) and, in one place, the male is said to be lead and the female orpiment.(2) We also find the alchemical work symbolised by the growth of the embryo in the womb. "Know," we are told, "... that out of the elect things nothing becomes useful without conjunction and regimen, because sperma is generated out of blood and desire. For the man mingling with the woman, the sperm is nourished by the humour of the womb, and by the moistening blood, and by heat, and when forty nights have elapsed the sperm is formed.... God has constituted that heat and blood for the nourishment of the sperm until the foetus is brought forth. So long as it is little, it is nourished with milk, and in proportion as the vital heat is maintained, the bones are strengthened. Thus it behoves you also to act in this Art."(3) (1) _Vide_ pp. 60 92, 96 97, 134, 135 and elsewhere in Mr WAITE'S translation. (2) _Ibid_., p. 57 (3) _Ibid_., pp. 179-181 (second recension); _cf_. pp. 103-104.